Electric meter.



* G. A.. SCHEBPBER ELECTRIC METER.

APPLICATION IILIlD .TAN.14, 19110 y 4 1,008,617; Patent ad`N0v. 14, 1911.

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G. A. SGHEEFPER. ELECTRIC METER. APPLICATION FILED JAN.14,*1910.

UNITED STATEQATENT OFFICE.

GUSTAVE A. SCHEEFFER, OF INDIANAPOLIS,4 INDIANA, ASSIGNOB- 'l 0 COLUMBIA METER COMPANY, F INDIANAPOLIS, INDIANA, A CORPORATION UF INDIANA.

ELECTRIC METER.

Specification of Letters Patent.

Paten'zed Nov. 14, 1911.

To all whom it may concern.'

Be it known that I, GUs'rAvE A. Serienr FER, a citizen of the United States, residing at Indianapolis, in the count-.y of; Marion and State of Indiana, have invented a certain new and useful Improvement in Electric 'Meters, ofwhich the following is a full,

clear, concise, and exact description, reference being had to the accompanying. drawin s, forming a part of this specication.

' invention relates to an improved form of electricity ineters adapt-ed to measure a quantity of electricity flowing through any given circuit.

My improved meter construction provides for accuracy of operation, ease of inspection and repair and durability of working parts.

My invention .consists particularly 1n the combination of the meter structure havinga rotatable armature and a starting coil adaptl ed to be connected in series with the armature to compensate for the friction of the moving parts and a compensating mechanism adapted to equalize the effects 'on theV armature coils of the starting coil, and also to equalizethe effects upon the armature of the series field winding employed therewith.

The several drawings illustrating my invention are as follows:

Figure 1 is a plan view of the meter mechanism complete with the casing thereof removed, and in this tigurea portion of the field coil is broken away to show more clearly the armature windingsand the starting coil. Fig. 2 is a lower end view of the parts shown in Fig. 1,'a portion of the parts being broken away to show thestructure of. tliesupporting posts and thc dispositlon of the armature. resistance upon one of the posts used to secure 'the cover inplace. ng. 3 is an end View of the armature and shows in dotted lines the relative, locations angulai-Aly, of the compensating devices used to equalize the rotative effort exerted by the starting coil and field coil upon the armature.

and 9 secured to the ba ie plate 1. The shaft 2 has mounted thereon three armature coils 10 dlsposed 1n operati 'e relation to a field coil 11 support-ed by brackets 12 from thei base plate -1. A startii g coil 13 is also supported from the base l in suitable manner so as to occupy a position practically par allel with-the field coi, 11, the function'of this starting coil being;- to exert a lrotative tendency upon the a1 mature windings to compensate for thei fr:btion df the moving parts. A commutator 14 is carried by the upper end of the arm ttureA shaft 2 and is connected with the windings 10. Brushes 15 are supported by bi ush holders 16 from the rocker arm V17 in ouch a manneras to rest upon the coinmutmtor 14. The rocker arm 11V is supported from the upper bearing 4 of the shaft 2. 'N ain supporting posts 18 extendvoutwardly from and are rigidly secured to the base pla e 1 and by means of arms 19 support a mzgnetic shield 2() between the permanent r iag'nets 6 and 7 and the field coil and arma ture windings. The plate 20 has secured ihereto a bracket 21 which forms the bea] ings for the worm` Wheel 22 engaging the vorm 23 on the shaft. 2. The posts 18 also-se 've to support the in tegratlng mechamsm 54 shown in Fig. 2.

Posts 25 and 2G exten( ing outwardly from and rigidly secured to the base plate 1, are provided to secure the 1 over in place to pro' tect the operating mechanism of the meter. A-resistance coil 27 in disposed upon the post 2G as indicated. su :h resistance coil bc.- ing connected in series .vith the armature as is the usual. practice.

The liracket'fl has ex tending therefrom a bent bar 2S of magneti( material which carries at its outer end a washer 29 through which is threaded a strew 30 ot magnetic material such screw leing point-ed at its upper end and so disp( sed as to be brought adjacent to the path of three bodies of ningnetic material 31 carri-el by the disk 5. such' bodies being equidistant. from the center of the shaft 2 and syn'metrically disposed angularly on the disk re latively to thea'rma-4 ture windings 10 in such manner that by the attraction exerted upon one' of suoli bodies as it approacl les' the magnetized screw 30, the decreasin g rotative effort exerted upon the coi-resp( nding armature coil at this time by either tk e starting coil or the field coil is compensate( for and as the magbracket.'

netic body passes the point of the screw 30, the attraction exerted between such body and the screw tends to retard the rotation of the disk 5 and to Athus (-.onipensate for any abnormal rotative effort that may at this time be exerted upon the.succeeding armature winding by the starting coil or field coil.

Since the bodies of magnetic material 3l, which may consist of soft iron rivets, are symmetrically disposed angularlyv relatively to the windings 10, by adjust-ing the screw 30 in the washer 29, just that degree" of 'accelei'ation and retardation will be exerted upon the disk 5 which is required to produce a uniform resultant motion of the armature and the parts driven thereby. The screw 30 is positively retained in any desired adjustment by the springing action of the Washer 29 and the end of the' bracket 28 permitted .by the slot The `adjustable screw 30 may be permanently magnet-ized itself in-order to 'constitute the adjusting pole referred to, ,but it is preferable to magnetize it by means of'one of the poles of the magnet 7 as indicated in the drawings by disposing the bentbar 28 which for this purpose -is of magnetic material in contactwith one of the' endsof the magnet 7.

Itwill bel-understood that the starting coil u sed in meters of this type is in reality a field coil-which produces a magnetic field of justsufficient strength to balance the fric tion ofthe moving parts of thc meter. By the term field coll, as used in the claims, therefore, I contemplate any construction offield coil that may by its inductive action Vproduce varying rotative efforts upon armature windings' sinceto any such condition my .compensatingl mechanism is applicab1e.

While I have s own mycomp'ensating de- 32 formed in such magnetic material carried by such shaft, a

disk, bo ies of magnetic material carried by such disk, number to the armature windings and occupying fixed and symmetrical positions relatively thereto, and a ma netic pole disposed adjacent to the path o such magnetic bodies.

2. In an electric meter, the combination of an armature' shaft, armature windings tive relation to such windin s, a disk of nonmagnetic material carried y such shaft, a

reta'rdin magnet disposed adjacent to such disk, bo ies of magnetic material carried by such disk, such bodies correspondin in number lto the armature windings an o o-- cupying xed and symmetrical positions relatively thereto, a bracket of magnetic such bodies corresponding in lretardin magnet'disposed adjacent to such 4carried by such shaft, a yfield coil in opera material supported by such magnet, and a screw of magnetic material supported by such bracket with its end adjacent to the path of such'bodies.

In Witness whereof, I hereunto subscribe myname this 28th day of December, A. D.

GUSTAVE A. SCHEEFFER. Witnesses:

ALBERTL. B ABB, JOHN E. Soo'rr.

Copies of this patent may :be-obtainedfor -ve cents each, 4by addressing the Conimissioner of I atentsg 

